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USS Permit (SSN-594)


Nuclear-Powered Attack Submarine


United States | 1962



"With the loss of USS Thresher to a diving trial accident, USS Permit assumed the lead of the now-renamed Permit-class nuclear-powered attack submarine group of the USN."



Authored By: Staff Writer | Last Edited: 09/12/2018 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
With the loss of USS Thresher (SSN-593) during a deep sea trials on April 10th, 1963, the United States Navy (USN) retired the "Thresher" name in remembrance and revised the Thresher-class to become the Permit-class after the second boat in the group. USS Permit (SSN-594) was ordered on January 27th, 1958 and built by the Mare Island Naval Shipyard in Vallejo, California. Her keel was laid down on May 1st, 1959 and she was launched to sea on July 1st, 1961. The boat was formally commissioned for service on May 29th, 1962.

USS Permit Walk-Around


USS Permit typically carried a crew of 105 and had a displacement of 3,760 tons (short) when surfaced and 4,370 tons when submerged. Dimensions included an overall length of 278.4 feet, a beam of 31.6 feet and a draught of 25.1 feet. Power was from a single S5W (Submarine, 5th Gen, Westinghouse) nuclear reactor tied to 2 x geared steam turbines developing 15,000 horsepower to a single shaft astern. 15 knots were attainable when surface running and nearly 30 knots could be reached when submerged. The hull was tested to a depth of 1,300 feet. Armament was 4 x 21" (533mm) torpedo tubes fitted amidships.

The Thresher-class


The Thresher-class was an important addition to the USN during this part of the Cold War period. The type was designed with noise reduction qualities to make her more resistant to sonar detection and the nuclear powerpack gave them essentially unlimited range under water - restricted mainly by crew fatigue and onboard food stores. The boats were also fast and appropriately armed for the purpose of engaging enemy forces on the sea and under it. The group served for some three decades and were succeeded by the Sturgeon-class.

Service History


On March 28th, 1963, USS Permit became the first USN submarine to successfully fire the in-development SUBROC missile and was used in testing the weapon at length. When USS Thresher was tragically lost in April of 1963, USS Permit stood up to take the lead of the Thresher-class - now renamed to Permit-class. An overhaul greeted her career during late 1966 and in May of the following year she joined with WESTPAC in the Pacific Theater before returning stateside to the American West Coast. The boat was given another overhaul in 1967 before returning to active service in the Pacific.

USS Permit was decommissioned on July 23rd, 1991 after several decades of faithful service and her name was struck from the Naval Register soon after. With her nuclear powerpack properly disposed of and her hull stripped of its military usefulness, the boat was sold off for scrap, bringing about her official end on September 30th, 1991.

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Power & Performance
Those special qualities that separate one sea-going vessel design from another. Performance specifications presented assume optimal operating conditions for USS Permit (SSN-594).
1 x S5W Pressurized Water Reactor, nuclear; 2 x Steam turbines delivering up to 15,000 shaft horsepower to 1 x shaft.
Propulsion
22.0 kts
25.3 mph
Surface Speed
20.0 kts
23.0 mph
Submerged Speed
Essentially Unlimited
Range
Structure
The bow-to-stern, port-to-starboard physical qualities of USS Permit (SSN-594).
105
Personnel
Complement
278.4 ft
84.86 meters
O/A Length
31.6 ft
9.63 meters
Beam
25.1 ft
7.65 meters
Draught
3,759
tons
Displacement
4,369
tons
Displacement (Submerged)
Armament
Available supported armament and special-mission equipment featured in the design of USS Permit (SSN-594).
4 x 21-inch (533) torpedo tubes amidships.
Ships-in-Class (13)
Notable series variants as part of the USS Permit (SSN-594) family line as relating to the Permit-class group.
USS Permit (SSN-594); USS Plunger (SSN-595); USS Barb (SSN-596); USS Pollack (SSN-603); USS Haddo (SSN-604); USS Jack (SSN-605); USS Tinosa (SSN-606); USS Dace (SSN-607); USS Guardfish (SSN-612); USS Flasher (SSN-613); USS Greenling (SSN-614); USS Gato (SSN-615); USS Haddock (SSN-621);
Operators
Global operator(s) of the USS Permit (SSN-594). Nations are displayed by flag, each linked to their respective national naval warfare listing.
National flag of the United States

[ United States ]
1 / 1
Image of the USS Permit (SSN-594)
Image from the Public Domain (United States Navy).

Mission Roles
Some designs are single-minded in their approach while others offer a more versatile solution to seaborne requirements.
BLUE WATER SERVICE
SUBMERGED ATTACK
MARITIME PATROL
FLEET SUPPORT
Recognition
Some designs stand the test of time while others are doomed to never advance beyond the drawing board; let history be their judge.
Going Further...
USS Permit (SSN-594) Nuclear-Powered Attack Submarine appears in the following collections:
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